Results 31 to 40 of about 16,751 (259)
X-ray spectra, light curves and SEDs of blazars frequently observed by Swift [PDF]
Monthly notices of the Royal Astronomical Society, 2021 Blazars research is one of the hot topics of contemporary extragalactic astrophysics. That is because these sources are the most abundant type of extragalactic γ-ray sources and are suspected to play a central role in multimessenger astrophysics.
P. Giommi +21 more
semanticscholar +1 more source
Basic properties of Fermi blazars and the ‘blazar sequence’ [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 By statistically analyzing a large sample which includes blazars of Fermi detection (FBs) and non-Fermi detection (NFBs), we find that there are significant differences between FBs and NFBs for redshift, black hole mass, jet kinetic power from "cavity" power, broad-line luminosity, and ratio of core luminosity to absolute V-band magnitude ($R_{\rm v}$),
Xiong, Dingrong +3 more
openaire +2 more sources
The recognition of blazars and the blazar spectral sequence [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 Accepted for publication in ...
Antón, S., Browne, I. W A
openaire +2 more sources
The Spectral Energy Distributions for 4FGL Blazars
Astrophysical Journal Supplement Series, 2022 In this paper, the multiwavelength data from radio to X-ray bands for 2709 blazars in the 4FGL-DR3 catalog are compiled to calculate their spectral energy distributions using a parabolic equation log(νfν)=P1logν−P22+P3 .
J. H. Yang +21 more
semanticscholar +1 more source
The Estimation of Fundamental Physics Parameters for Fermi-LAT Blazars [PDF]
Astrophysical Journal, 2021 Aiming to delineate the physical framework of blazars, we present an effective method to estimate four important parameters based on the idea proposed by Becker & Kafatos, including the upper limit of central black hole mass M, the Doppler factor δ, the ...
Z. Pei +4 more
semanticscholar +1 more source
High-energy neutrino emission from blazars [PDF]
, 2022 Active galactic nuclei (AGN) with relativistic jets are the most powerful persistent astrophysical sources of electromagnetic radiation in the Universe.
Foteini Oikonomou, Oikonomou, Foteini
core +1 more source
SYNCHROTRON POLARIZATION IN BLAZARS [PDF]
The Astrophysical Journal, 2014 We present a detailed analysis of time- and energy-dependent synchrotron polarization signatures in a shock-in-jet model for gamma-ray blazars. Our calculations employ a full 3D radiation transfer code, assuming a helical magnetic field throughout the jet.
Haocheng Zhang +2 more
openaire +4 more sources
X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304
Galaxies, 2020 We reviewed X-ray flux and spectral variability properties studied to date by various X-ray satellites for Mrk 421 and PKS 2155-304, which are TeV emitting blazars. Mrk 421 and PKS 2155-304 are the most X-ray luminous blazars in the northern and southern
Alok C. Gupta
doaj +1 more source
A Comprehensive Power Spectral Density Analysis of Astronomical Time Series. I. The Fermi-LAT Gamma-Ray Light Curves of Selected Blazars [PDF]
Astrophysical Journal Supplement Series, 2020 We present the results of the Fermi-Large Area Telescope 10 yr long light curve (LC) modeling of selected blazars: six flat-spectrum radio quasars (FSRQs) and five BL Lacertae (BL Lacs), examined in 7, 10, and 14 day binning.
M. Tarnopolski +3 more
semanticscholar +1 more source
Unifying MeV-blazars with GeV-blazars [PDF]
, 2002 We demonstrate that the spectral differences between Flat Spectrum Radio Quasars (FSRQ) with steep gamma-ray spectra (MeV-blazars) and FSRQ with flat gamma-ray spectra (GeV-blazars) can be explained by assuming that in the MeV-blazars, the production of gamma-rays is dominated by Comptonization of infrared radiation of hot dust, whereas in the GeV ...
Blazejowski, M. +3 more
openaire +3 more sources